mc update

docs/3D Scanning and Printing.md

@@ -145,6 +145,9 @@ If I can have more time on the machines I can modify the mechanisms by trying ou
 
 [Design for 3d printing tutorials](<https://www.3dhubs.com/knowledge-base/>)
 
+Here are some notes on principles of additive manufacturing.  
+![](./images/3dpd/principles.jpg)  
+
 7. Photogrammetry
 
 I used Agisoft Metashape to make a pointcloud. I followed this [tutorial by Agisoft](<https://agisoft.freshdesk.com/support/solutions/articles/31000152092-3d-model-reconstruction>).

docs/Molding & Casting.md

@@ -166,6 +166,23 @@ Will do this step when I'm back in the lab.
 
 Will do this step when I'm back in the lab.
 
+#### REferences
+
+Process of making a mold and casting objects:  
+![](./images/mc/moldcast.jpg)  
+
+Types of endmills:  
+![](./images/mc/types.jpg)  
+
+Climb vs Conventional cutting:  
+![](./images/mc/rotation.jpg)  
+
+Drilling vs Milling:  
+![](./images/mc/drilling.jpg)  
+
+Centering:  
+![](./images/mc/centering.jpg)  
+
 ### Files
 * [Dodecahedron 3D model](./images/mc/dodecahedron.3dm.zip)  
 * [STL file](./images/mc/dodecahedronCAM.stl.zip)